Morphological evolution of Yangtze Estuary on decadal-scale and its response to human interference

Hualong Luan, Pingxing Ding, Zhengbing Wang, Jianzhong Ge

Friday 3 july 2015

11:30 - 11:45h at Antarctica (level 0)

Themes: (T) Sediment management and morphodynamics, (ST) Morphodynamics of estuaries and coastal areas

Parallel session: 15A. Sediment - Coast

Previous studies indicated that Yangtze Estuary (YE) had experienced from sediment accumulation to net erosion in submerge delta front within last half century responding to the reduction of fluvial sediment input caused by upstream dam constructions. The present research analysis the morphological evolution of the entire estuary including tidal channel within estuary and mouth bar area based on historical navigation charts and observed bathymetric maps. Results indicated that the response to human interference (fluvial sediment reduction, engineering works) varied spatially. The mouth bar region was still accumulating sediment after upstream sediment input declined while the tidal channel within YE converted from deposition to erosion especially in shallow area.